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Investments - Components of Net Investment Income (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Net Investment Income [Line Items] |  |  |  |
Gross investment income | $ 924 | $ 739 | $ 2,609 | $ 2,042
Investment expenses | (10) | (7) | (26) | (20)
Net Investment Income | 914 | 732 | 2,583 | 2,022
Available-for-sale Securities |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income | 907 | 722 | 2,553 | 1,980
Total equity securities |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income | 17 | 17 | 56 | 62
Total equity securities | Nonredeemable preferred stocks |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income | 6 | 9 | 19 | 30
Total equity securities | Common equities |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income | 11 | 8 | 37 | 32
Total fixed maturities |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income | 887 | 713 | 2,487 | 1,935
Total fixed maturities | U.S. government obligations |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income | 470 | 396 | 1,314 | 1,064
Total fixed maturities | State and local government obligations |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income | 24 | 16 | 64 | 42
Total fixed maturities | Corporate and other debt securities |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income | 214 | 155 | 593 | 417
Total fixed maturities | Residential mortgage-backed securities |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income | 38 | 14 | 95 | 27
Total fixed maturities | Commercial mortgage-backed securities |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income | 63 | 49 | 175 | 142
Total fixed maturities | Other asset-backed securities |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income | 78 | 83 | 246 | 243
Short-term investments |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income | $ 20 | $ 9 | $ 66 | $ 45

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